
Originally Posted by
weegillis
That depends. Is the old site still up, or is it gone from the web?
Are they still the same products? Are you trying to keep their indexed references alive, or do want them to disappear from the index? If the latter, then yes, just leave them with 404 so the SE's will see it and remove them. If the former, then you will want at the very least a blanket redirect from the old site (assuming it is still up) to the new one. If the site is gone, (no namespace) then there is no form of redirect you can use, and your new site will have to strike out fresh.
You don't want 404 coming up for anything in the index if you still want to use that reference, that's the main thing. Perhaps you can narrow the field to just redirect a group of old pages to a new main catalog page for that group?